Blind rivet air tool



2 sheets-sheet 1 mvmToRS W. BELL ETAL BLIND RIVET AIR TOOL Aug. 1l, 1970Filed May lO, 1968 lgll 1970 f W. BELL ETAL 3,523,441

BLIND RvETAIR TOOL Filed May l0. 1968 2 Sheets-Sheet 2 ATTORNEY UnitedStates Patent O 3,523,441 BLIND RIVET AIR TOOL Walter Bell, Monroe,Zdzislaw Richard Kurc, Cornwall,

and George L. Timm, Highland Mills, N.Y., assignors to Star ExpansionIndustries Corporation, Mountainville, N.Y., a corporation of DelawareFiled May 10, 1968, Ser. No. 728,204 Int. Cl. B21d 9/05 U.S. Cl. 72-3918 Claims ABSTRACT OF THE DISCLOSURE An improvement in a rivet settingtool which is pneumatically operated wherein the pneumatic means isoperable to retain rivets in position and to eject the severed rivetmandrel stems therefrom automatically utilizing a common source ofpneumatic power, which improvement resides ina new and unique triggerfor the tool which permits ejection of rivet mandrels and air out of thedevice only when the trigger is at least slightly depressed, saidtrigger being the same trigger which operates the rivet pulling means ofthe rivet setting tool.

BACKGROUND `OF THE INVENTION Field of the invention This inventionresides in the eld of pneumatic power operated rivet setting toolsparticularly adapted for the setting of blind rivet assemblies of thetype wherein the rivet barrel is set in a workpiece by the tensioning ofa mandrel stem having an enlarged rivet setting head engageable with theblind end of the rivet barrel. Further, this tool can be eifectivelyemployed for the tensioning of a mandrel in a rivet assembly whereinupon completion of the rivet setting operation the mandrel stern isdesigned to sever or break as a result of the tensioning stress appliedby the setting tool.

Discussion of the prior art Pneumatically operated power tools forupsetting, power tools are generally and broadly known in the art.Recently, a blind rivet setting tool which is pneumatically operated hasbeen proposed which is provided with means for pulling and therebysevering rivet mandrels and with means for ejecting the severed mandrelsautomatically using a common pneumatic power source. The mandrels areejected due to creation of at least a partial vacuum. When the tool isoperated, valve means are provided to direct incoming air "into a numberof cylinder units employed for severing the rivet mandrel. A directpassage carries air constantly toward the rearward portion of the toolto create the vacuum. This means that air is constantly passing throughthe device and out the rearward exit even when the rivet pullingoperation is not being performed. This is undesirable for reasons ofnoise and the like. It is desired to perform the rivet mandrel severingoperation at the same time or as close to the same time as the rivetejecting operation and to limit the ejection of rivet mandrels and airto a time in which the main rivet setting function is being performed.

'SUMMARY `OF THE INVENTION Objects of the invention It is an object ofthis invention, therefore, to provide a rivet setting tool whichfunctions to sever rivet mandrels thereby setting the rivet and to ejectthe severed mandrel from the tool which functions are performed using acommon source of pneumatic power wherein the rivet ejecting function andany air used therefore is prohibited from being emitted from said toolat any time other than 3,523,441 Patented Aug. 11, 1970 ICC betweencommencement and termination of the rivet severing function.

This and other objects and advantages will become apparent from thefollowing description and claims.

STATEMENT OF THE INVENTION Broadly, this invention contemplates animprovement in a blind rivet setting tool which is pneumaticallyoperated, said tool operable to set rivets by severing rivet mandrelsand to eject the severed mandrel from said tool using a common source ofpneumatic power, said tool provided with means of directing incoming airtoward a cylinder assembly and means for directing incoming air towardthe rearward portion of said tool and into a Venturi passage and out ofsaid tool whereby the vacuum created due to passage of said air out ofsaid tool causes severed j mandrels to be ejected out of said tool, saidimprovement comprising a trigger operable to operate a valve in thepower air line and a valve in an ejecting air line.

In a particularly desirable embodiment, the invention contemplates suchan improvement wherein the trigger 0perates to open the valve in theejecting air line prior to opening the valve in the power air line and,preferably, holds the valve in the ejecting air line open after thevalve in the power air line is closed.

BRIEF DESCRIPTION OF THE DRAWINGS The invention can be more readilyunderstood and appreciated by reference to the accompanying drawings inwhich:

FIG. 1 is a sectional view partly broken away showing the tool in theextended, normal, at rest position and a rivet disposed therein;

FIG. 2 is a front elevational view of the tool partly broken away;

FIG. 3 is a sectional view taken along line 3 3 of FIG. 2;

FIG. 4 is a sectional view taken along line 4 4 of FIG. 2;

FIG. 5 is a rear elevational view of the tool showing the deflectingboot in section;

FIG. 6 is a sectional view taken along line 6 6 of FIG. 5;

FIG. 7 is a sectional FIG. 5; and

FIG. 8 is a sectional view taken along line 8 8 of FIG. l.

lview taken along line 7 7 or DESCRIPTION OF THE PREFERRED EMBODIMENTSReferring to the drawings and in particular to FIG. 1, the rivet pullingtool therein illustrated is provided with a rivet engaging and pullingassembly, indicated in general by the numeral 22, a cylinder assembly,indicated in general by the arrow 20, within which is housed thepneumatic motor mechanism to provide the requisite reciprocative linearmotion for the operation of the pulling assembly; and a handle portion24 providing the requisite means for connecting the tool to a source ofcompressed air as well as constituting a support for trigger operatedvalve 94 means for controlling the operation of the tool.

-In FIG. l there is shown a pair of workpieces A and B, such as metalplates each having a drilled opening into which a rivet body C to be sethas been inserted. The mandrel portion D of the rivet assembly is theninserted into the nosepiece of the pulling head assembly until the anvilthroat 26 of the nose piece is in rm contact with the flanged portion ofthe rivet body. The pulling head assembly 22 is of well known type inits operation. The following brief description will sutiice to explainthe cooperative interrelation of the pulling head assembly with the restof the tool.

PULLING HEAD ASSEMBLY The pulling head assembly 22 is of a hollowtubular construction and includes a tubular housing 28 having a bore 30within which a jaw case or retainer 32 is slidably mounted for axialreciprocation. Three toothed jaw members 34 are cooperatively arrangedin a circle within jaws retainer 32, so that forward pressure of thejaws against the inner end 36 of the nosepiece 26 will force the jawsapart to receive or release the mandrel stem D. The separation of thejaws is additionally accomplished by the tubular jaw expander 38, theforward or proximal end of which is provided with beveled surfaces whichare in camming engagement with the complementary surfaces of the rearend surfaces of the jaw members, thereby forcing the jaw members apartunder the resilient action of the compression spring `40. It will benoted that the bore 42 forms a continuation of the mandrel receivingbore defined by the juxtaposed faces of the jaw members. Rearwardretractive movement of the jaws retainer 32 causes the jaws to grip andto tension the mandrel stem D as the jaws are moved rearwardly towardthe remote end of the tool.

In this connection it will be noted that the anvil throat end of thenosepiece 26 forms an abutment means for the flanged end of the rivetbody. It will be further noted that the jaw case or retainer 32 isprovided with a bore having a tapered or frusto-conical forward portion.The jaw members 34 taper in a forward direction in a mannercomplementary to the frusto-conical surface defined by the bore of thejaw retainer 32. The retainer and jaws held thereby are power-operatedrearwardly by means of draw barrel 44 which is in threaded engagementwith the jaws retainer 32. The draw barrel 44 in turn forms part of apneumatically operated piston assembly to be hereinafter described. Itwill be noted at this point that the forward or proximal end 46 of thedraw barrel 44 is enlarged and is slidably journaled in housing 28 andbears against the sealing O-ring `48 which provides an air seal thereforduring the reciprocation thereof. The bore 50 extending throughout thelength of the draw barrel is coaxial with the bores defined by the jaws34 and the tubular jaws expander 38 and forms a continuation thereof.

PISTON HEAD ASSEMBLY The draw barrel 44 is provided with a shoulder 52from which a reduced diameter piston rod portion 54 extends rearwardlyand effectively supports a plurality of circular piston heads 56a, b andc. The piston heads 56a, b and c are provided with a central bore 58.The piston heads are similar in construction and are equidistantlyspaced along said piston rod portion 54 of the draw barrel 44 by meansof intermediate spacer bushings 60.

The remote or rear end of the piston rod portion 54 of the draw barrelis threaded and mounts a clamping nut 62. A washer `62a is interposedbetween the nut 62 and the raised boss formed on the rear face of thepiston head 56C surrounding the bore 58. As a consequence of thisarrangement the tightening of the nut 62 effectively clamps the pistonheads 56a, b and c in position and thus forms a unitary piston assemblycomprised of the draw barrel and the piston heads mounted thereon. Itwill be noted that the draw barrel is provided with a liner 64 whichincludes a funnel shaped forward portion at its forward end and a tailportion 66 which extends beyond the draw barrel y44. The opening of thefunnel is reinforced against end 46 by reinforcing material 64a.

CYLINDER ASSEMBLY The piston assembly is disposed within the cylinderassembly of the tool for reciprocative movement therein. The cylinderassembly is comprised of a front cylinder unit designated generally bythe numeral 68, a rear end plate designated generally by the numeral 70,and intermediate cylinder units designated generally by the numerals 72and 72a. It will be understood, as will more clearly appear hereafter,that the end plate 70 may be mounted directly upon the front cylinderunit 68 or one or more intermediate cylinders may be interposedtherebetween in accordance with the power requirements of the particularapplication. As will be seen from said FIG. l, the front cylinder unit68 is comprised of a cylinder shell portion having an integrally formedhandle portion 24 depending therefrom. The cylinder head 74 of frontcylinder unit is provided with a threaded central bore 76 within whichthe tubular housing 28 of the rivet engaging and pullling assembly 22 isreceived so as to threadedly mount the same. A plurality ofcircumferentially spaced apertured ears 78 are provided on the externalsurface of the unit for receiving the clamping bolts `80. The cylindershell of the front cylinder unit has disposed therein piston head 56a ofthe pis` ton assembly for reciprocation therein under pneumaticpressure. In order to provide for an air seal an O-ring 82 is disposedwithin a circumferential groove found in each of the piston heads 56a, band c and comprises a piston ring therefor.

It will be noted that in the at rest or normal position of the tool thefront face of the piston head abuts the raised boss `84 formed on theinterior face of the front cylinder head 74 and that a circulardepressed area surrounds said boss. There is thus formed a pocket 86into which compressed air may be introduced to initiate the power strokeof the tool as will more particularly appear hereinafter.

The front cylinder unit 68 is also provided with conduit means forconnection to a source of compressed air supply and for introducing thesame at the desired locations in the tool. Thus the handle portion 24has formed therein an air inlet conduit 88 which is provided with athreaded mouth 90 suitable for connection to the coupling element of anair supply hose and an exhaust conduit 90a through whlch the spentcompressed air from the cylinders may be exhausted.

As may be seen from FIGS. 1 and 4, the handle also has formed therein asby means of suitably drilling the same through the body of the unit andplugging the undesired openmgs, a plurality of air passages. Since,after the initial lntroduction of air into the front cylinder unit theow is utilized .for two independent purposes, namely, for providmg a1rpower to the cylinders on the one hand, and for producmg a vacuum bymeans of a Venturi arrangement, the air or passages for the former willbe designated as power air and passages, while the air or passages forthe latter will be designated as Venturi air or passages.

Thus air introduced into the air inlet conduit passes into the rearportion of a valve chamber as indicated 92 and thence into the body of acartridge valve 94 disposed within a portion of said chamber. Cartridgevalve 94 controls the flow of power air and is of conventional designand will not be described in detail. The Valve 94 is operated by meansof a reciprocable trigger or plunger 96 which is provided with ahemispherical end 98 which bears against the valve end. The movement ofthe trigger is limited by means of a cross-pin 21 which is disposedwithin a larger diameter transverse bore 23 formed in the body of thetrigger. This same trigger is operative to open and close the valve inthe Venturi air passage as more fully described below. When the triggeris depressed, power air from chamber 92 is permitted to pass through thevalve into the opening 25 of power passage 27. Power passage 27 isdiagonally disposed within the handle body and extends into the cylinderportion of the front cylinder unit. As may be seen from FIG. 1, powerpassage 27 traverses the juncture of the front cylinder head 74 with thecylinder wall 29 to thus form a power air port into the interior of thefront cylinder. It will be noted that the port opens into the depressedarea of the interior of the cylinder head.

It will also be noted that power passage 27 also intersects an axiallyextending power passage, not shown, which passage is open at the rearface of the cylinder wall 37. It will thus be apparent that compressedair introduced through conduit 88 is passed into the front cylinderunder the control of a manually operable valve and is then conductedinto the cylinder proper and that a further power air passage isprovided in the cylinder wall for feeding power air into the nextadjacent cylinders in the same manner, a power passage 27a, 27b orconduit provided therefor and at each cylinder head an air inlet so asto enable cylinder units 72 and 72a to act similarly. The power passages27, 27a, 27 b are also utilized for exhausting spent air from thecylinders on the return stroke of the pistons. The return stroke of thepistons is initiated by the release of finger pressure upon trigger 96which permits the cartridge valve to return to its normal positionshutting off communication between the opening 25 of passage 27 and therear portion of valve chamber 98. The valve simultaneously openscommunication between the opening 25 of passage 27 and the reducedportion 37 of exhaust conduit 90, the bottom of which is open to theatmosphere. The spent power air may thus pass through exhaust conduit90a via the aforementioned passages.

The vacuum forming Venturi arrangement requires a source of compressedair which is introduced through opening 39 as may be seen in FIGS. 1 and3 and more particularly in FIGS. 4, 6 and 8. Opening 39 communicateswith diagonally extending Venturi air passage 41 which in turnintersects and therefore communicates with axially extending Venturi airpassage 43 disposed in the front cylinder wall and is open at the rearface of cylinder wall 37 as indicated at 45, so that it Will provide fora flow of Venturi air to the next adjacent cylinder. It will be notedthat the axially extending power passage for the cylinders which is notvisible in the drawings and passage 43 is disposed in parallel relationalong opposing sides of the bore within which a clamping bolt 80 isdisposed. i

The intermediate cylinder unit is also provided with air passage meansIwhereby it is connected to the source of air power for actuating thepiston disposed therein. Thus, an axially disposed power air passageextends from face to face of the cylinder wall in registry with thepower air passage which runs parallel to passage 43. A short diagonalbore 27a and 27b at the convergence of the interior ofthe cylinder headwith the side wall provides communication with the exterior of thecylinder in the recessed area of the cylinder head without interferingwith the continuity of the power air passage employed so that the nextadjacent unit can be supplied therethrough. It will be apparent thatwhen the intermediate cylinder unit is brought into clamping engagementwith the cylinder head, a power air supply passage therefor isautomatically established as well as with a next succeeding unit, ifneeded. The aforementioned power air passage also functions as anexhaust passage for the spent air upon the return stroke of the piston.In like manner, the intermediate cylinder unit when clamped in positionautomatically forms part of a continuous passage for the supply of airto the Venturi or vacuum arrangement. Thus there is provided a throughpassage which registers with the opening 45 of Venturi air passage 43 ofthe front cylinder head unit thus forming a continuity thereof forsupplying the desired air to the ultimate point of application.

As heretofore stated intermediate cylinder unit 72a is in all respectssimilar in construction to unit 72 and serves to illustrate the modularcharacter of the instant invention. Any desired number of intermediatecylinder units may be assembled and interposed between the frontcylinder unit and the end plate assembly depending upon the powerrequirements of the particular application. With the addition ofintermediate power units an increase in effective power of the tool isreadily accomplished. It will of course be understood that a change inthe number of intermediate cylinder units also involves a change in thepiston assembly to accommodate the same.

END PLATE ASSEMBLY The tool is enclosed by means of an end plateassembly designated generally by the numeral 70. The said end plateassembly may be more particularly seen from FIGS. 1 and 5. It comprisesan end wall 61 which is of the same general conformation as thecylindrical shell portions of the front and intermediate cylinder units.It is similarly provided with a circumferential recess 63 which receivesthe end of the preceding cylinder wall. Registering, circumferentiallyspaced apertured ears 78 are adapted to receive the ends of the clampingbolts 80 so that it may be assembled therewith and clamped thereto toform a unitary structure. The clamping action is accomplished by meansof the nuts 65 in engagement with the threaded ends of the clampingbolts 80. The end wall portion 61 of the end plate is provided with acircular recess 67 within which a ring 69, formed of rubber or the like,is disposed. The ring 69 forms a bumper or shock absorbing pad for thepiston head 56a as it abuts against the same upon reaching the limit ofits rearward movement during the power stroke of the tool. Aconsiderably deeper circular recess or groove 71 is formed in the neckportion 73 of the end plate and defines a sleeve 75 about which thereturn spring 77 is disposed. Said return spring 77 is of thecompression type, one end of said spring abutting washer 62a and beingdisposed about nut 62 which thus prevents it from being dislocated,while the other end of said spring is seated at the bottom of groove 71and is retained against dislocation by means of sleeve 75. Spring 77 iscompressed during the retractive or power stroke of the tool and servesto return the piston assembly to its extended, normal or at restposition by reason of the resilient action thereof.

The neck portion 73 of the back plate 70 houses a Venturi type vacuumdevice which serves to retain a rivet disposed within the pulling headof the tool as it is manipulated into position with respect to aworkpiece, and also serves to withdraw and eject the severed portion ofthe rivet mandrel from the tool proper. It is a significant feature ofthis invention that the vacuum forming means is integrated with the tooland is rendered operative by the same supply source of compressed air asis used to actuate the tool and that a common trigger is operative tooperate the valves for the Venturi vacuum assembly and the powerassembly.

The Venturi type vacuum forming arrangement is more particularlyillustrated in FIGS. 1 and 8. As will be seen from said figures saidarrangement designated generally by the numeral 79 is comprised of anouter tube 81 and an inner tube 83 disposed therein. Outer tube 81 isprovided with a peripheral groove 85 into which a portion of atransverse locking pin 87 extends to lock the same in position withrespect to the neck portion of the back plate as seen in FIGS. 5 and 6.Said outer tube wall is also provided with a recessed portion 89 havinga triangular configuration in cross section. The tube wall defined bysaid recess is provided with spaced aperture 91 which provides airpassage from the space defined by the recessed portion into theinteriorof the outer tube.

The portion of the inner tube juxtaposed to said aperture 91 is ofreduced diameter and provides a constructed circular orifice inconjunction with the interior wall of the outer tube thereby creating aVenturi effect in a well known manner. When a fiow of air is introducedinto the interior of the Venturi arrangement in the manner indicated,the air is moved in the direction of the arrow E thereby inducing apressure drop downstream of the air flow. In order to induce the vacuumdownstream of the Venturi arrangement, means are provided for conductinga flow of air thereto. To this end the back plate is provided with adiagonal Venturi air passage 97 through web 101, the lower end of whichis open at the front face of the end wall portion 61 of the end plate 70and registers with a Venturi air passage from intermediate cylinder 72a.The upper end of Venturi air passage 97 tangentially opens into the boreof the end plate neck 73 into the space dened by the recessed portion 91in the peripheral surface of the outer tube 81, from whence it may enterthe interior of the Venturi tube arrangement through aperture 91 causinga vacuum to be created throughout the length of the axial bore definedthroughout the length of the tool. The flow of air supplied to theVenturi may be regulated by means of a rotatable metering valve 99interposed in passage 97. Rotation of the valve element causes the crossbore in the valve to register in varying degree with the passage and maythus be used to regulate the air flow or to shut it off completely.FIGS. 6 and 7 showing the valve in closed position, when rotated in thedirection indicated by the arow in FIG. 7, alignment of the cross borewith the axis of the passage will open the same. A sealing arrangementis provided comprising of a pair of O-rings 99a which are held inposition on each side of web 101 by means of push nuts so that the valvearm 103 may be rotated without leakage of air. This valve is provided sothat the operator can choose if he wishes to use the ejecting deviceand, if not, close this valve.

A deecting boot 105 preferably formed of a hard rubber or the like ismounted on the neck of the end plate as by means of a rib and groovearrangement. The deflecting boot directs the severed mandrel stem awayfrom the operator as indicated at F in FIG. l.

THE TRIGGER-VALVE MECHANISM The trigger-valve assembly is illustrated inFIGS. 1, 3 and 4. As seen therein, a plunger 96 is provided foroperation of the cartridge valve above referred to. Embedded withinplunger 96 in a recess 150 is a vertical portion 152 of the Venturivalve which portion bends and extends into the handle portion 24horizontally at 154. A decreased diameter extension member 156 isprovided around which is an O-ring 160 which sits between the end wallof the horizontal portion 154 and the wall 162 to which member 156 isattached. In the horizontal portion 168, small passage 164 permits airow into Venturi pasage 45. At the end of the second horizontal portion154 there is integral therewith piece 168 lling the bore 170. Thisentire assembly is rideable in the bore 170. Piece 168 lies in the pathof Venturi passageway 41 when the tool is in rest. When the plunger 96is actuated, the Venturi valve is pushed inwardly in bore 170 so thatthe passage 164 is in the path of Venturi passageway 41 and, air ispermitted to Iflow through the valve into Venturi passage 45 and intothe Venturi assembly to perform the exhausting or vacuuming operationwherein severed rivet stems are ejected from the tool.

It will be observed that this can be done without opening the powercartridge valve to begin setting rivets. This is due to the fact thatthe power valve is not immediately responsive to movement of the plunger96 but requires movement of the plunger sufficient for the wall 172 tomove sufliciently forward to open the power valve. Conversely, when thetrigger is released slightly the power valve closes sufliciently toprevent air from going to the cylinders. Nevertheless, air can stillpass through the Venturi valve as long as the plunger 96 remainsslightly depressed. Thus, as long as the trigger 96 is not depressed, noair ows to the mandrel ejection device. When the operator depresses thetrigger only slightly, say 1A; inch, air flows to the mandrel-ejectiondevice. This ejects a mandrel, should there be one left in the tool, andalso serves to hold in place a new rivet in the nosepiece of the tool.Depressing the trigger slightly further operates the original or powervalve which in fturn releases air to the cylinders of the tool, and therivet is installed in the work. The operator can release the triggeronly slightly. The original or power valve is thus closed olf, and thecylinders return to their passive position, releasing the jaws fromtheir grip on the brokenotf mandrel. The mandrel is ejected rearwardlyfrom the tool and the operator releases the trigger fully and all airstops.

This assembly has the advantage that it decreases substantially theamount of high pressure air wasted and decreases the overall noise whileproviding the operator with full control of all functions through use ofa single trigger.

In accordance with a preferred embodiment of the present invention asshown in the accompanying drawings, a two-position trigger is providedso that the operator has the option of choosing to have the rivetejection system operated only when the rivet severing system is inoperation i.e. so that the rivet ejecting system is not in operationunless the rivet severing system is operated. To this end, the side wall172 of the cartridge valve at a point substantially intermediate, theends of elongated slot 23 of elongated configuration is provided with anopening 231) of sufficient size to permit entry therein of pin 21.Generally speaking, the position of opening 23h is just rearward of theforward end of the elongated slot 23 and is correlated so that itsdistance between that point and a point on the vertical plane passingthrough the rearward end of the elongated slot 23 corresponds to thedistance the trigger must be depressed to engage the rivet severingsystem. Thus by removing pin 21 and placing opening 23b in registry withthe transverse bore and reinserting pin 21 into the transverse borethrough opening 2311, the trigger is caused to operate fthe cartridgevalve and the rivet ejecting valve concurrently, there being no give dueto provision of an elongated slot which permits independent operation ofthe rivet ejecting system. To facilitate the change, a second opening150b having the same shape as first opening 150 is provided so that whenthe assembly is turned the vertical portion 152 can be inserted in anappropriate recess. Thus it is seen that simply by removing pin 21 andturning plunger 96 including wall 172 and reinserting pin 21 throughelongated slot 23 or 23b, the operator can choose whether the triggermechanism is to operate the ejection system and the severing systemtogether or whether the ejection system shall be engaged before thesevering system. In the latter case, the pin 21 passes through theelongated slot 23 whereas the simple circular opening 23h is used in thefirst alternative.

It will be seen from the foregoing that a tool is provided which mayutilize one or more cylinders for the pneumatic operation. The powerapplied to the mandrel stem Will be in direct proportion to the numberof cylinders utilized. By the use of the valve and trigger mechanismshown and described, -additional advantages are realized within highlyuseful tools.

While certain preferred and desirable embodiments have been shown anddescribed above, these have been shown and described merely for purposesof illustration and not for purposes of limitation, as there is nointention in the use of the terms and expressions employed herein ofexcluding any equivalents thereof, or portions thereof, within thespirit and scope of the invention.

'What is claimed is:

1. Au improvement in a blind rivet setting tool which is pneumaticallyoperated, said tool operable to set rivets by severing rivet mandrelsand to eject the Severed mandrel from said tool using a common source ofpneumatic power, said tool provided with means for directing incomingair toward a cylinder assembly and means for directing incoming airtoward the rearward portion of said tool and into a Venturi passage andout of said tool whereby the vacuum created due to passage of said airout of said tool causes severed mandrels to be ejected out of said tool,said improvement comprising a trigger operable to operate a valve in thepower air line to said cylinder assembly and a valve in an ejecting airline.

2. An improvement according to claim 1 wherein said trigger operates toopen the valve in said ejecting air line prior to opening the valve insaid power air line.

3. An improvement according to claim Z wherein said trigger is operableto hold said valve in said ejecting air line in opened position aftersaid valve in said power line is closed.

4. An improvement according to claim 1 wherein said valve in said powerair line is a cartridge valve and said valve in said ejecting air linecomprising a rod member movable in a bore in said tool and having aportion of decreased diameter whereby movement of said rod is registrywith said ejecting air line permits air to pass through said valve.

5. An improvement according to claim 4 wherein said rod member isembedded with said trigger whereby lateral movement of said triggermoves said rod member and said cartridge valve is opened until saidtrigger has moved a predetermined distance.

6. An improvement according to claim 1 wherein said trigger is adaptablein a first position to operate to open the valve in said ejecting airline prior to opening the valve in said power air line and in a secondposition to operate the valve in said ejecting air line and the Valve insaid power air line concurrently.

7. An improvement according to claim `6 wherein said trigger isadaptable in said second position to hold said value in said ejectingair line in opened position after said valve in said power line isclosed.

8. An improvement according to claim 7 wherein the trigger comprises aplunger section and wall provided on its side with an elongated slot andalong said wall a second opening just large enough to accommodate a pinpassing therethrough, said second opening being between the extremitiesof the elongated slot and just rearward of the forward extremity, atransverse bore within an interior support portion of said trigger whichbore can be in registry with said elongated slot and said second openingand held in registry by said pin, means within said plunger toaccommodate means associated with said valve in said ejecting air linewhen said elongated slot is in registry with said transverse bore andwhen said second opening is in registry with said bore.

References Cited UNITED STATES PATENTS 2,088,859 S/1937 Huck 72-3913,082,898 3/1963 Bosch 72-391 3,196,662 7/1965 Simmons 72--391 3,415,10212/1968 Elliott 72-391 3,451,248 6/1969 Bell 72--391 CHARLES W. LANHAM,Primary Examiner G. P. CROSBY, Assistant Examiner U.S. Cl. X.R. 72-45 3

